Fixes and language class

Hi!

I made small changes:
* <code>config.php</code> file was renamed <code>config.example.php</code>,
because the root is .gitignore that ignores the config.php file transfer during commit.

<b>For dev: It is only one note (!) To make sure everything was ok, create a new <code>config.php</code> file and leave <code>config.example.php</code></b>

<hr>

When problems with this run

         git rm --cached app/core/config.php

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I added my language class is a little simpler, use is similar,
in constuctor when calling in as the second parameter, you can specify the language, eg:

         $this->language->load('welcome', 'pl');

then load file from:

          app/language/pl/welcome.php